A pushdown is a strength training

Strength training

Strength training is the use of resistance to muscular contraction to build the strength, anaerobic endurance, and size of skeletal muscles. There are many different methods of strength training, the most common being the use of gravity or elastic/hydraulic forces to oppose muscle contraction...

 exercise used for strengthening the triceps muscles in the back of the arm. The exercise is completed by pushing an object downward against resistance. It is a little known fact that doing the triceps pushdown also works the biceps muscle as well. This is also vice-versa for the bicep curls, which work the triceps.